A MONOGRAPH OF THE EXISTING CKINOIDS 649 



The other specimen from Bock's station 40 was assigned by Gisl6n to Comanthus 

 parvicirra /3 comanihipmna. The controdoisai is 3 mm. in diameter. 



The cirri are VII, 13-14, from 8 to 9 mm. in length, stouter and more strongly 

 curved than in the preceding. 



The ends of the basal rays arc visible interradially. 



Of the IIBr series, 6 are 2 and 4 are 4 (3 + 4). The 2 IIIBr scries are 4 (3+4). 



The 22 ai-ms are 105 mm. long. There are 12 or 13 brachials for each 10 mm. 

 of arm length, or 10 if the syzygial pairs are counted as units. The width of the 

 arms at the base is 2.3 mm. 



The distal intersyzygial interval is 4 muscidar articulations. 



Pd is 13 mm. long with about 40 segments. The comb resembles that in typical 

 species of the subgenus Cenolia, being composed of about 12 low thin teeth which 

 both proximally and distally die away gradually. The tip of the pinnule has 2 or 3 

 smooth segments. P, is about 12 mm. long. Pj is 5.5 mm. long. P3 and the 

 following pinnules are without a comb. The distal pinnules are 11 mm. long and 

 are composed of 27 segments. The segments are half again as long as broad, and the 

 4 terminal are provided with distal hooks. The pinnules of some of the arms are 

 without ambulacral grooves. 



Three specimens collected by Prof. Edward S. Morse in Tokyo Bay were exam- 

 ined by Dr. Clemens Hartlaub. He noted that the centrodorsal is very flat and 

 moderately large. 



In a young individual the cirri are about XXVIII, in the older specimens about 

 XXV, and arc up to 10 mm. in length. The number of segments is at the highest 16. 

 The fifth-seventh segments are elongated. From the eighth onward the cirrus 

 segments bear a dorsal transverse ridge which in the terminal segments lies not at 

 the distal edge but more in the middle of the segments. On each end this transverse 

 ridge terminates in a spinelike point, so that when viewed from above these distal 

 cirrus segments seem to bear 2 short spines. 



The radials are concealed. The union between the elements of the IBr series 

 and the first 2 elements of the IIBr series is extremely close. The IIBr series are 

 4 (3 + 4). There are no IIIBr series. 



The arms are 19 or 20 in number. The brachials have strongly produced and 

 overlapping distal ends. 



Syzygies occur between brachials 3+4 and 11 + 12, and distally at intervals of 

 usually 4 muscular articulations. The syzygial unions are not smooth, but the 

 edges of the brachials are here produced as in the case of the other articidations. 



Pd is 10 mm. long, slender, with a short comb at the end. Pi is simUar but 

 somewhat shorter. The fourth, fifth, and sixth brachials bear similar pinnules, after 

 which follow thick genital pinnules. 



The color is uniform bro\vn. 



Hartlaub described these specimens as belonging to tj'pus A of Comanthus parvi- 

 cirra { = C. mmoana), but other specimens from the same lot which I have seen seem 

 not to differ from true parvicirra. 



